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In order to judge whether the vacuum pumping effect is ideal, the customer mailed the products from the factory for experiments. During the process of vacuum pumping with the external vacuum packaging machine, it was found that the air is difficult to be discharged, and the vacuum effect is not obvious after vacuum pumping. Later, engineers observed that the reason why the vacuum was not able to get gas was because the suction nozzle was in the foam box during the pumping process, which caused the suction nozzle to be blocked by the foam box. Because the foam box is airtight, the vacuum packaging machine has no effect.
In order to solve this problem, it is recommended that customers buy vertical cabinet vacuum packaging machine. Vertical cabinet vacuum packaging machine belongs to internal pumping vacuum packaging machine. The working principles of internal pumping vacuum packaging machine and external pumping vacuum packaging machine are different. It exhausts through the air pressure difference, so there is no obstruction of gas.
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